look up any word, like smh:
 
3.
to whack it off, polish your knob
"knock it off Tom!" Tom's mother said. Tom replied, "Bitch, I only do that to hot chicks that aren't blood related, DARRR."
by BitchinChris69 October 31, 2006
 
1.
stop it, desist (often a stern command)
Knock it off you freaking scallywags.
by Light Joker October 17, 2005
 
2.
Southern term meaning, to obtain, recieve, or buy something
Mayne, i just knocked off those new J's.
You see that chain? I'm gonna have to knock it off.
by Spencer Evans April 18, 2005